public class Java007 {
    public static void main(String[] args){
        int day,remaindday = 0,cycle;
        double storageday,expend,all,storageweek,remaind;
        storageday = 2.5;
        expend  = 6;
        all = 100;
        storageweek = storageday*5-expend;
        double a=(all-6)/storageweek;
        cycle = (int)a;
        remaind = all-cycle*storageweek;
        if(remaind%2.5!=0){
            remaindday=(int)(remaind/2.5+1);
        }
        day=cycle*5+remaindday;
        System.out.println(day);

    }
}
//作业1：
//	 *  你妈妈每天给你2.5元，你都会存起来，但是当这一天是
//	 *  存前的第五天或者是5的倍数的时候，你就会去花6元钱，
//	 *  多久你能存到100元